Fig. 6
From: Validation of a wireless dry electrode system for electroencephalography
Grand-average power spectral density showing alpha wave attenuation at Pz during the eyes-open and eyes-closed recording conditions. Bold tracings indicate the eyes-open condition, lighter tracings indicate the eyes-closed condition. Solid line indicates the wet electrode system [Mitsar] output, the dashed lines indicate the dry electrode system [Versus] output